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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '586d4241c917070ba200da36ddba975535edd8393b9cfb262919245abbb0b8f1' 
  AND token = 'n9QmXI4aS3nBK0UFLcYFf5OHxQlcdgO6YfyoLG9JFFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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