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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7563308df036041b73e4bbf3aef2c442bb6431d557c2525484956d53d312882a' 
  AND token = 'swWN4bQlXbD6Lp5uyMV+F7kst+9wVTC5eEtx0PEjGOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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