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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaf5775f70c69676c7c0ab9a81b3bf1f8ed448626db661847363261537aa3f08' 
  AND token = 'MHQqOyOVazryad7m1LSyWviVOM2GxGS5G1onA3Q4Q6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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