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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d3b74389286c7f81c184789010130686e6565bbb67f9963e40e06ba8608ea90' 
  AND token = 'R1QLrgincC1E8HrpNq0ttzFE2wB36bgq6m/KFMhywN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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