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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60715d0582da315db5573977377ad8cd170d72b71e35cff5a0a59792caa71b6b' 
  AND token = 'OGWV0vmJdJs1fJPUzvHrjhfy0dirL4J7VQjn/VplMNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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