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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0419dfde45fbc75a0c1ce196551c89402e09a60566e0017a44d7ff727e1db54b' 
  AND token = 'S/01PdxGrFtb2aQDjP6O78DUxDRq7okTX7sTy1cpFRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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