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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c07b321a45778d7d4232a3b90d1c3b2d0b102af9968415a2af15681cfc022e83' 
  AND token = 'GyTYZJX0kAd/O4vDQYOsSSJAjcmHU88j4HnB5+DEer0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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