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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be098e88612ea84796e722cb8d3ba1d2697e68c5d0ae274b79a85c48f06a057a' 
  AND token = 'SoJFH2BNAmJa1UJnWYyltIFRdblPEyTof8WW8jbkzfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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