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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d87db9e69fcd8cd58587731bc7239c18aec7217dd511f99fa40a0b2c47e5ed0' 
  AND token = 'gitsssyRFtTziTm5R/M4qMxZboU/bt+aJzOHV+Rc1N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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