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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8facc4965d8a6b46aa57679a8f0c2a8fa4d763ac47c342a57a838864121fa79' 
  AND token = 'N4/7bOJPZ/AdRZy1EF+/Ip9fcYK+J2ygJXPi5i6NcKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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