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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c342ec37ce306497d876643a085a208015be5f48bf4eee5e10b10cb154bf60a' 
  AND token = 'sNT2nIOq1AytN0PIXqrGpkmQ+Yw8CYY5s35K8HzDKPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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