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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d89a1c8853e3afb8bb4941f075b1880b4d6eacc13aff216c316b31c8eda6216' 
  AND token = '4kMRZa+tQX8MGBWerqcu5qTzyIya04Y+xCKYQbUrJwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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