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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1f62df392be8cacd95af6b16ea2ca334199510b1b05dc1f2b0d83d5d3a0414d' 
  AND token = 'MYv91+p1YYh8yV/DozLM1+3As3e56wB2iicdgS8P/ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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