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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c99fa6c62dcd9dd120a17f64560cb4f91eca72b299adbb124ca89834edd24792' 
  AND token = '5u/eBoC/KweKV+MfiyxtGPvkUyqfQK+al2q0oh5ksbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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