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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a28d7a8d0f528384e6b4c71b412c7a7fd5f82473e31bcd47fa9db76f054ef16' 
  AND token = 'OALdEO1t8QNtv3qnQVxzeJnp8C4oZjvh51J5VRMz5wY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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