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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9f529db08e4b673641da711e9074d85cdbec361288396f0368eafb54c58c1ce' 
  AND token = 'u8WuX3CDx0X+Jl6+uZN0nx3hrCw3A2RTg0Cqi4Juvv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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