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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '055d21b475044a3e4fb1eff1f948b705207e9229461222eae5d9791cce173e18' 
  AND token = '0eHIWt0ktv6BVLbLRo8nID9hbjIHqnlrESw/R7gMBdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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