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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c40e539ce19b3a6441172ea6a4c8c21f6c2dd4aff177f56379dfdbb8a6d0eb87' 
  AND token = '0CTeMpe2/I4xhgVr2rorQfSCYLCMXHDd4eNekfdUwVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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