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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ede67c7a63424300ccb0c1556a5c643e5d092ec8c19a80f24d051c52bba8fabe' 
  AND token = 'eMJggC75pTbwPcS/ttKcR8tDlrIlhL1uN1GSY2+gtgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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