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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49bd3ba5672dddeec2876d52634e85d25379e44c2c1e0225e890a8f8c589fd34' 
  AND token = 'qea+qTM1GY7AJc095xRGXCWg3lsr1FH9q96IejHoqZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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