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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92bbdb0dc13ea6aa494ca78f90b68a38672b6f8b02e2f685bb095747a0ff1599' 
  AND token = 'w8a17VgdJp9ZCCOG3INJpW7GV86WhGhSKQysmhxAStM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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