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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a94580666bbc4d50330dea309f498a9b11d22fcb48c46564abe699bbf7a57e03' 
  AND token = 'g1YwkII9loW9i4sW59ThhmHqTU4zSLohQ2dbjs7nTBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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