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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf63a22d3a6b343dd9f2b4d5acbeb872ab6c39f51dd25486df6c6361f521d97b' 
  AND token = 'h+abHHkfNO9p76z4/D0XK0sp6roRcT0GRQzGY5MCf98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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