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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03a7f77e64b2c65b0992c29b0ff242efc47731dfdb8d300130ef17e0faff6fd4' 
  AND token = '+sGL8P9WO0/gdTwelEpEh+OYI8utv8Wx8i5sU6Bx/nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}