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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8dc949adb85155aa29f23782f8437cec0eabf2b1512cfbc5db12f897a3f4db7' 
  AND token = 'eCpICpg9z+klHcRIBh93L9Ff6xESaayo3m2RkijjfJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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