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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56872d71ceaad1103546e338bc702bd5eec607acdedd429c31cb75d26d7becf1' 
  AND token = 'b/3pbjJYGHg8Su4l95S3kEG3FqkNrODE5LHY/Q/kuNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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