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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27c504d62dbca5ec998deaedf5678c23fc97f92bc0ff009470aa02fda4b8fee1' 
  AND token = 'KOr4Url8kogfV5yQn0y6bBjRhNwUtyVEQ+kqbnh7erQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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