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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88c65152b15df23297c639d917dfa967d5152037582abfe268e5eed4e789a9c2' 
  AND token = 'ayFh1VPB9hZaxOzY3n2gbtYffvG2HIvIGcYM8n3dvr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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