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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d89a2b12d5b40a7fdac6137261cd1f9f0b7a0103690344d7a0866ec8c6e65f6' 
  AND token = 'xYDIAEzygkMsqxB5r0HLpY8/Q20VMR/b09tdAEr+ZmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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