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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd57859198928407c64956a56b77a2934471dacfae1c3cb748cb3c1267512bcfb' 
  AND token = 'J0B1HyBmor6D7MIRtKheJaPGS/LN051EPu3tCCUtXBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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