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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '126e46091c8b8cb64974ce91bfd13c0ead7ec0b12ff308a4f542b7805a0303ac' 
  AND token = 'lkfp5FlNKOAEn3safA6sPWxLJ5/8HGSm0u0HbDNmbQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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