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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cea48ce965a365ac486d6a87a2583378edcb173f87eb7a8f696b126d08dfdc0' 
  AND token = 'DALQSP0QXOp1D338v2lE4zP5JLyZGDQGbxZd1AYN2j8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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