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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffa83ebe59309646c4000d317dc1b9c9244563440285878cf6093f6daa50760b' 
  AND token = 'nf9ruyF+10fZNwEAXTkp2UDinSHYuDuIdA3cnuWjDi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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