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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f948287ef17aebce22609ef004ec67b8fbabf11ef4f9eb07f7a0951d524e0f5' 
  AND token = 'HrOc6LN81bwTx3IN1i/uuKXdVE5EO12Ipi5x+idNu/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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