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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2f1e345dd8f43f92b418ea8a47c13d26761d40efa4a93c40b880116d1adf9a1' 
  AND token = 'OQMuO+oaxEpURlGMFTT1BEI6RcXhnYFdxdR6IF0P+10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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