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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca31ea6e788ab762be5734d9adc1463e99f9e0578ada7b91c876e313d1ef0a60' 
  AND token = 'BHxl5DurXeydsRyYnBrmexRKwHRyaAAU5cb5lw60SME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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