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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cc9cbe557894458cc3bdc0bdc722b241f2ac221b3fce3e820255540e8b0f0a7' 
  AND token = '6CUBcOgjPcFplc2ZetgSB5gbu6A4FiJH4OtAKC4mmGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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