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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de93fa143e660c4e6eecf83e179d7df651c55c95818ebefcde746d2cfc54ceab' 
  AND token = 'N9KSoq2muJKbNDa29kHp5ef6pXQDMDVdVa3mJC2co78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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