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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '984247038f1df43273acd543538126db21263295d6f1a907b863135fb8381dcd' 
  AND token = '5cCyN5p5i+DN97paS6jDztODEsYc1NqIaUQsgAB1EoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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