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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b911325343359eba8333dd2070383978261c5f7426f56229e9a50affdbca78b8' 
  AND token = 'x+Pjuew90z3Mh0gg+L7M8jNd9COJd8nmpETV3E8+zuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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