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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5a1daff6aabc11e913fe691fe76a7bf7d61baa43690c678a9ee0e7e703c04df' 
  AND token = 'xAPGgtHr9d+xRZ1PKOSoyfWmW40i7x3PHzbO+RZ8wLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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