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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2990dba240fc782a2bf0cfe5e8bc193627d110d367bd839a825a4d0eca61d979' 
  AND token = 'Cn4ts3rVOwyuLYs98XZU4jz44m61kaD9IQ2o5ms0+pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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