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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f15a4c03da3ed70fbb3e4488d25c2cf620f23aabc9a8e0c6496ff9594f21f88b' 
  AND token = 'AyBPmcu5GUoLXBOVD1iVBaoKuMWSzqSepB/SXGNwncg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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