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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48a65399d2d666c8bc1b6010d44fac5a5b3166a2902301d5609708d376d81377' 
  AND token = '8FtatmXKrkk+BNA5Go2Pu33Oo9NPlS9U1YYrPYFG1jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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