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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1406b6d0fd3c740ce00a2c33c654f32581c02e74728f019f43f473ab1d499d2' 
  AND token = 'u5g5UrkeEWt5SgEJj9PtR8+jcEOn7eV16bRvbqV5M3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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