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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67e33595629dc08727dc77cf6921f08618d11be5597045210d56e8685bf4cc60' 
  AND token = '88s0sdyt7cCzcs0phdZpgpzX2ZJLAYvkSRc5nbvJuXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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