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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c88b97ce5f654c9c5bf8b0fadd8cdae19d9b5f15d87669aff309c0a42c56fae' 
  AND token = '66ToAuf6Z6osuOTmMzDd/GAcvLPh0EdX3PfZ2/FdExw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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