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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd61950270e9cbfc0ca4d151dfeb1e6b07bd4d51e086a059b5f911eb2df57e292' 
  AND token = 'ZFf2Q3MPYFtWikjOhYInDRGCfEQ+nsjXCvWU13HswZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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