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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23a49de7d3da9992b5e11d3b21fb0e49b48e3d6b2c498bca4f6f97568d261e74' 
  AND token = 'V3IgHek/9akmxL/rswT12fATPUy8s4YKQRl4TNSlD2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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