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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c58a227453aa00ea2a3f4a5154de5b03bd9dd73961e1d4250aed5cd3b51ef10' 
  AND token = 'DMu82Ea/obNVB07YSBt4atrPWaAuqRB7ApBp7XU14tI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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